Who invented the scale?

In 5000 BC. The Egyptians were the first people to build the beam balance and weight goods. Pans hung from both ends of a balance beam. In one pan the load to be weighed was placed, and in the second pan the weights were put, until both the pans were perfectly balanced. The earliest and the smallest unit of weight was a gain of wheat and it was used to weigh gold. The steelyard has been used as a weighing device since 2000 BC. It has two arms of different lengths and uses a counterweight that slides along the calibrated longer arm to counterbalance the load on the other arm and indicate its weight.

What is triangular trade?

Triangular trade means trading through a third party. There is no direct exchange between two trading partners. Instead, dealers buy the goods from an overseas market and sell them in the home market to the consumer. They are, therefore, an intermediary between the manufacture and the consumer and make a living from the profit made by selling the goods. The term triangular trade is often associated with the trading of slaves in the 18^th century: Europeans traveled to Africa with goods like weapons, cloth, salt, bought salves in return, and sold them in America in exchange for cane sugar product such as rum.

How were distance measured?

In ancient times, the Egyptians and the Babylonian used their body parts as measurement tools. A very old unit of measurement is the cubit : It is the length from the elbow to the tip of the middle finger. Smaller lengths were specified by the length of a finger or the span of the palm-this is the stretched hand from the tip of the thumb to that of the little finger. The foot was also used to measure distances – just as the step and the double step. The Romans also use these measures. A Roman mile had a thousand double steps, and each double step measured five Roman feet.